\( S_5 = 4 \cdot \frac{(\frac{3}{2})^5 - 1}{\frac{3}{2} - 1} = 4 \cdot \frac{\frac{243}{32} - 1}{\frac{1}{2}} = 4 \cdot \frac{\frac{211}{32}}{\frac{1}{2}} = 4 \cdot \frac{211}{32} \cdot 2 = 8 \cdot \frac{211}{32} = \frac{1688}{32} = 52.75 \).

Sun, 03 May 2026 16:35:29 +0000

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